Improvement in carpenters  adjustable bevels



:,1. ROBINSON N HENRY FAINBANKS..

Improvement'i'n Carper-iters4 Adjustable Bevels.

TATES ITE PATENT Enron.

ISAIAH J.. ROBINSON AND HENRY FAIRBANKS, OF ST. JOHNSBURY, VT.

4IMPROVEMENT IN CARPENTERS ADJUSTABLE BEVELS.

Specification `forming part of Letters Patent No. 125,617, dated April 9, 1872.

To all whom t may concern:

Be it known that we, IsArAH J. ROBINSON and HENRY FAIRBANKS, of St. Johnsbury, in

the county of Caledonia and State of Vermont,

rtion, and represents, in-

Figure 1, a front view; Fig. 2, a side view 5 Fig. 3, the same with a portion of the handle removed; and in Fig. 4, a vertical central section of Fig. 2.

This invention relates to an improvementin the instrument known as bevel or adjustable squares, the object being to construct the instrument so that the blade may be adjustable to any angle, and be iirmly and securely set when in position of a right-angle, or at any other previously-determined an gle; and the invention consists, first, in the arrangement of a sliding piece within the handle, combined with the blade, and constructed so that a longitudinal movement imparted to the said slid-` "sentin g the end of the said sliding piece to the edge oi' the blade, and which, forced against the edge ofthe blade, sets the blade to the angle indicated by the end of the slide 5 second, in combining with a slide, constructed as above, a device for securing the said sliding piece in position.

A is one side of the handle, and B the other side, constructed and united at their lower end so as to form a slit between the two parts to receive the blade O, the blade having a slot, D, working over a pivot, E, in substantially the usual manner. One side of the handle, here represented as B, is chambered out, as seen in Figs. 3 and 4, to receive the piece F fitted therein so as to have a longitudinal movement, its upper end, or the end nearest the blade being formed upon the angle at which it is desired to set the blade, usually a right angle. This recess or chamber is provided with an incline, a, as seen in Fig. 4, so that moving the said piece F longitudinally the upper end Will ride up on the said incline, and be thereby forced outward into the slit and come beneath the blade, as seen :in Fig. 4 3 but when drawn back, as denoted in the broken lines, Fig. 4, the said piece is entirely within the recess in the handle, and will a1- low the free turning of the blade, as in common bevels; but when the angle determined by the end of the piece F is required, the

piece F is forced up against the edge of the blade, which brings the blade to that defined position, and there the blade may be set in the usual manner for setting the blade in other bevels, or otherwise.

To thus actuate the slide we combine with the said slide a mechanism, here represented as an eccentric,Gr, having a bearing in the handle, and working in a slot, d, in the said slide, so that by the turningof the said eccentric to the position denoted in Fig. 3 the slide is thrown up; or turning down, as denoted in broken lines, Fig. 3, the slide is drawn back; and this is here represented as being done by a lever, H, outside the handle; but other equivalent devices for moving and securing the slide in position may be employed.

We claim as our invention- 1. The sliding piece F, having a combined longitudinal and transverse movement, so as by the said movement to present itself to the blade to set the blade at right angles, or to withdraw when not required for this use, sub

stantially as described. 2. In combination with the subject-matter ofthe first clause of claim, we claim the eccentric G, or equivalent, for securing the said piece F in position, 'substantially as described.

I. J. ROBINSON. Witnesses: HENRY FAIRBANKS.

THADnnUs FAIRBANKS, A. N. FArRnANKs. 

